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 /* rxi_syscall is currently not prototyped */
14 #include <afsconfig.h>
15 #include <afs/param.h>
22 # include <WINNT/syscfg.h>
26 #if !defined(AFS_AIX_ENV) && !defined(AFS_NT40_ENV)
27 # include <sys/syscall.h>
29 #include <afs/afs_args.h>
30 #include <afs/afsutil.h>
32 #ifndef IPPORT_USERRESERVED
33 /* If in.h doesn't define this, define it anyway. Unfortunately, defining
34 this doesn't put the code into the kernel to restrict kernel assigned
35 port numbers to numbers below IPPORT_USERRESERVED... */
36 #define IPPORT_USERRESERVED 5000
39 #if defined(AFS_LINUX22_ENV) && defined(AFS_RXERRQ_ENV)
40 # include <linux/types.h>
41 # include <linux/errqueue.h>
42 # if defined(AFS_ADAPT_PMTU) && !defined(IP_MTU)
48 #include "rx_atomic.h"
49 #include "rx_globals.h"
52 #include "rx_packet.h"
53 #include "rx_internal.h"
55 #ifdef AFS_PTHREAD_ENV
58 * The rx_if_init_mutex mutex protects the following global variables:
62 afs_kmutex_t rx_if_init_mutex;
63 #define LOCK_IF_INIT MUTEX_ENTER(&rx_if_init_mutex)
64 #define UNLOCK_IF_INIT MUTEX_EXIT(&rx_if_init_mutex)
67 * The rx_if_mutex mutex protects the following global variables:
73 afs_kmutex_t rx_if_mutex;
74 #define LOCK_IF MUTEX_ENTER(&rx_if_mutex)
75 #define UNLOCK_IF MUTEX_EXIT(&rx_if_mutex)
78 #define UNLOCK_IF_INIT
81 #endif /* AFS_PTHREAD_ENV */
85 * Make a socket for receiving/sending IP packets. Set it into non-blocking
86 * and large buffering modes. If port isn't specified, the kernel will pick
87 * one. Returns the socket (>= 0) on success. Returns OSI_NULLSOCKET on
88 * failure. Port must be in network byte order.
91 rxi_GetHostUDPSocket(u_int ahost, u_short port)
94 osi_socket socketFd = OSI_NULLSOCKET;
95 struct sockaddr_in taddr;
96 char *name = "rxi_GetUDPSocket: ";
97 #ifdef AFS_LINUX22_ENV
98 # if defined(AFS_ADAPT_PMTU)
99 int pmtu = IP_PMTUDISC_WANT;
101 int pmtu = IP_PMTUDISC_DONT;
105 #if !defined(AFS_NT40_ENV)
106 if (ntohs(port) >= IPPORT_RESERVED && ntohs(port) < IPPORT_USERRESERVED) {
107 /* (osi_Msg "%s*WARNING* port number %d is not a reserved port number. Use port numbers above %d\n", name, port, IPPORT_USERRESERVED);
110 if (ntohs(port) > 0 && ntohs(port) < IPPORT_RESERVED && geteuid() != 0) {
112 "%sport number %d is a reserved port number which may only be used by root. Use port numbers above %d\n",
113 name, ntohs(port), IPPORT_USERRESERVED);
117 socketFd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
119 if (socketFd == OSI_NULLSOCKET) {
121 fprintf(stderr, "socket() failed with error %u\n", WSAGetLastError());
129 rxi_xmit_init(socketFd);
130 #endif /* AFS_NT40_ENV */
132 taddr.sin_addr.s_addr = ahost;
133 taddr.sin_family = AF_INET;
134 taddr.sin_port = (u_short) port;
135 #ifdef STRUCT_SOCKADDR_HAS_SA_LEN
136 taddr.sin_len = sizeof(struct sockaddr_in);
138 #define MAX_RX_BINDS 10
139 for (binds = 0; binds < MAX_RX_BINDS; binds++) {
142 code = bind(socketFd, (struct sockaddr *)&taddr, sizeof(taddr));
146 (osi_Msg "%sbind failed\n", name);
149 #if !defined(AFS_NT40_ENV)
151 * Set close-on-exec on rx socket
153 fcntl(socketFd, F_SETFD, 1);
156 /* Use one of three different ways of getting a socket buffer expanded to
164 len2 = rx_UdpBufSize;
166 /* find the size closest to rx_UdpBufSize that will be accepted */
167 while (!greedy && len2 > len1) {
170 (socketFd, SOL_SOCKET, SO_RCVBUF, (char *)&len2,
176 /* but do not let it get smaller than 32K */
186 (socketFd, SOL_SOCKET, SO_SNDBUF, (char *)&len1,
190 (socketFd, SOL_SOCKET, SO_RCVBUF, (char *)&len2,
193 (osi_Msg "%s*WARNING* Unable to increase buffering on socket\n",
196 rx_atomic_set(&rx_stats.socketGreedy, greedy);
199 #ifdef AFS_LINUX22_ENV
200 setsockopt(socketFd, SOL_IP, IP_MTU_DISCOVER, &pmtu, sizeof(pmtu));
202 #ifdef AFS_RXERRQ_ENV
205 setsockopt(socketFd, SOL_IP, IP_RECVERR, &recverr, sizeof(recverr));
208 if (rxi_Listen(socketFd) < 0) {
216 if (socketFd != OSI_NULLSOCKET)
217 closesocket(socketFd);
219 if (socketFd != OSI_NULLSOCKET)
223 return OSI_NULLSOCKET;
227 rxi_GetUDPSocket(u_short port)
229 return rxi_GetHostUDPSocket(htonl(INADDR_ANY), port);
233 osi_Panic(char *msg, ...)
237 (osi_Msg "Fatal Rx error: ");
246 * osi_AssertFailU() -- used by the osi_Assert() macro.
250 osi_AssertFailU(const char *expr, const char *file, int line)
252 osi_Panic("assertion failed: %s, file: %s, line: %d\n", expr,
256 #if defined(AFS_AIX32_ENV) && !defined(KERNEL)
258 static const char memZero;
260 osi_Alloc(afs_int32 x)
263 * 0-length allocs may return NULL ptr from malloc, so we special-case
264 * things so that NULL returned iff an error occurred
267 return (void *)&memZero;
272 osi_Free(void *x, afs_int32 size)
279 #endif /* defined(AFS_AIX32_ENV) && !defined(KERNEL) */
281 #define ADDRSPERSITE 16
284 static afs_uint32 rxi_NetAddrs[ADDRSPERSITE]; /* host order */
285 static int myNetMTUs[ADDRSPERSITE];
286 static int myNetMasks[ADDRSPERSITE];
287 static int myNetFlags[ADDRSPERSITE];
288 static u_int rxi_numNetAddrs;
289 static int Inited = 0;
291 #if defined(AFS_NT40_ENV)
295 /* The IP address list can change so we must query for it */
298 /* we don't want to use the loopback adapter which is first */
299 /* this is a bad bad hack */
300 if (rxi_numNetAddrs > 1)
301 return htonl(rxi_NetAddrs[1]);
302 else if (rxi_numNetAddrs > 0)
303 return htonl(rxi_NetAddrs[0]);
309 ** return number of addresses
310 ** and the addresses themselves in the buffer
311 ** maxSize - max number of interfaces to return.
314 rx_getAllAddr(afs_uint32 * buffer, int maxSize)
316 int count = 0, offset = 0;
318 /* The IP address list can change so we must query for it */
321 for (count = 0; offset < rxi_numNetAddrs && maxSize > 0;
322 count++, offset++, maxSize--)
323 buffer[count] = htonl(rxi_NetAddrs[offset]);
328 /* this function returns the total number of interface addresses
329 * the buffer has to be passed in by the caller. It also returns
330 * the matching interface mask and mtu. All values are returned
331 * in network byte order.
334 rx_getAllAddrMaskMtu(afs_uint32 addrBuffer[], afs_uint32 maskBuffer[],
335 afs_uint32 mtuBuffer[], int maxSize)
337 int count = 0, offset = 0;
339 /* The IP address list can change so we must query for it */
343 offset < rxi_numNetAddrs && maxSize > 0;
344 count++, offset++, maxSize--) {
345 addrBuffer[count] = htonl(rxi_NetAddrs[offset]);
346 maskBuffer[count] = htonl(myNetMasks[offset]);
347 mtuBuffer[count] = htonl(myNetMTUs[offset]);
354 extern rx_atomic_t rxinit_status;
356 rxi_InitMorePackets(void) {
357 int npackets, ncbufs;
359 ncbufs = (rx_maxJumboRecvSize - RX_FIRSTBUFFERSIZE);
361 ncbufs = ncbufs / RX_CBUFFERSIZE;
362 npackets = rx_initSendWindow - 1;
363 rxi_MorePackets(npackets * (ncbufs + 1));
375 if (Inited < 2 && !rx_atomic_test_bit(&rxinit_status, 0)) {
376 /* We couldn't initialize more packets earlier.
378 rxi_InitMorePackets();
388 rxi_numNetAddrs = ADDRSPERSITE;
389 (void)syscfg_GetIFInfo(&rxi_numNetAddrs, rxi_NetAddrs,
390 myNetMasks, myNetMTUs, myNetFlags);
392 for (i = 0; i < rxi_numNetAddrs; i++) {
393 rxsize = rxi_AdjustIfMTU(myNetMTUs[i] - RX_IPUDP_SIZE);
395 rxi_nRecvFrags * rxsize + (rxi_nRecvFrags - 1) * UDP_HDR_SIZE;
396 maxsize = rxi_AdjustMaxMTU(rxsize, maxsize);
397 if (rx_maxReceiveSize > maxsize) {
398 rx_maxReceiveSize = MIN(RX_MAX_PACKET_SIZE, maxsize);
400 MIN(rx_maxReceiveSize, rx_maxReceiveSizeUser);
402 if (rx_MyMaxSendSize > maxsize) {
403 rx_MyMaxSendSize = MIN(RX_MAX_PACKET_SIZE, maxsize);
409 * If rxinit_status is still set, rx_InitHost() has yet to be called
410 * and we therefore do not have any mutex locks initialized. As a
411 * result we cannot call rxi_MorePackets() without crashing.
413 if (rx_atomic_test_bit(&rxinit_status, 0))
416 rxi_InitMorePackets();
421 fudge_netmask(afs_uint32 addr)
427 else if (IN_CLASSB(addr))
429 else if (IN_CLASSC(addr))
439 #if !defined(AFS_AIX_ENV) && !defined(AFS_NT40_ENV) && !defined(AFS_LINUX20_ENV)
441 rxi_syscall(afs_uint32 a3, afs_uint32 a4, void *a5)
446 old = signal(SIGSYS, SIG_IGN);
448 #if defined(AFS_SGI_ENV)
449 rcode = afs_syscall(AFS_SYSCALL, 28, a3, a4, a5);
451 rcode = syscall(AFS_SYSCALL, 28 /* AFSCALL_CALL */ , a3, a4, a5);
452 #endif /* AFS_SGI_ENV */
458 #endif /* AFS_AIX_ENV */
467 struct ifreq ifs[ADDRSPERSITE];
470 char buf[BUFSIZ], *cp, *cplim;
472 struct sockaddr_in *a;
483 memset(rxi_NetAddrs, 0, sizeof(rxi_NetAddrs));
484 memset(myNetFlags, 0, sizeof(myNetFlags));
485 memset(myNetMTUs, 0, sizeof(myNetMTUs));
486 memset(myNetMasks, 0, sizeof(myNetMasks));
488 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
489 if (s == OSI_NULLSOCKET)
492 ifc.ifc_len = sizeof(buf);
496 ifc.ifc_len = sizeof(ifs);
497 ifc.ifc_buf = (caddr_t) & ifs[0];
498 memset(&ifs[0], 0, sizeof(ifs));
500 res = ioctl(s, SIOCGIFCONF, &ifc);
502 /* fputs(stderr, "ioctl error IFCONF\n"); */
509 #define size(p) MAX((p).sa_len, sizeof(p))
510 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
511 for (cp = buf; cp < cplim;
512 cp += sizeof(ifr->ifr_name) + MAX(a->sin_len, sizeof(*a))) {
513 if (rxi_numNetAddrs >= ADDRSPERSITE)
516 ifr = (struct ifreq *)cp;
518 len = ifc.ifc_len / sizeof(struct ifreq);
519 if (len > ADDRSPERSITE)
522 for (i = 0; i < len; ++i) {
524 res = ioctl(s, SIOCGIFADDR, ifr);
527 /* fputs(stderr, "ioctl error IFADDR\n");
528 * perror(ifr->ifr_name); */
531 a = (struct sockaddr_in *)&ifr->ifr_addr;
532 if (a->sin_family != AF_INET)
534 rxi_NetAddrs[rxi_numNetAddrs] = ntohl(a->sin_addr.s_addr);
535 if (rx_IsLoopbackAddr(rxi_NetAddrs[rxi_numNetAddrs])) {
536 /* we don't really care about "localhost" */
539 for (j = 0; j < rxi_numNetAddrs; j++) {
540 if (rxi_NetAddrs[j] == rxi_NetAddrs[rxi_numNetAddrs])
543 if (j < rxi_numNetAddrs)
546 /* fprintf(stderr, "if %s addr=%x\n", ifr->ifr_name,
547 * rxi_NetAddrs[rxi_numNetAddrs]); */
550 res = ioctl(s, SIOCGIFFLAGS, ifr);
552 myNetFlags[rxi_numNetAddrs] = ifr->ifr_flags;
554 /* Handle aliased loopbacks as well. */
555 if (ifr->ifr_flags & IFF_LOOPBACK)
558 /* fprintf(stderr, "if %s flags=%x\n",
559 * ifr->ifr_name, ifr->ifr_flags); */
561 * fputs(stderr, "ioctl error IFFLAGS\n");
562 * perror(ifr->ifr_name); */
564 #endif /* SIOCGIFFLAGS */
566 #if !defined(AFS_AIX_ENV) && !defined(AFS_LINUX20_ENV)
567 /* this won't run on an AIX system w/o a cache manager */
568 rxi_syscallp = rxi_syscall;
571 /* If I refer to kernel extensions that aren't loaded on AIX, the
572 * program refuses to load and run, so I simply can't include the
573 * following code. Fortunately, AIX is the one operating system in
574 * which the subsequent ioctl works reliably. */
576 if ((*rxi_syscallp) (20 /*AFSOP_GETMTU */ ,
577 htonl(rxi_NetAddrs[rxi_numNetAddrs]),
578 &(myNetMTUs[rxi_numNetAddrs]))) {
579 /* fputs(stderr, "syscall error GETMTU\n");
580 * perror(ifr->ifr_name); */
581 myNetMTUs[rxi_numNetAddrs] = 0;
583 if ((*rxi_syscallp) (42 /*AFSOP_GETMASK */ ,
584 htonl(rxi_NetAddrs[rxi_numNetAddrs]),
585 &(myNetMasks[rxi_numNetAddrs]))) {
586 /* fputs(stderr, "syscall error GETMASK\n");
587 * perror(ifr->ifr_name); */
588 myNetMasks[rxi_numNetAddrs] = 0;
590 myNetMasks[rxi_numNetAddrs] =
591 ntohl(myNetMasks[rxi_numNetAddrs]);
592 /* fprintf(stderr, "if %s mask=0x%x\n",
593 * ifr->ifr_name, myNetMasks[rxi_numNetAddrs]); */
596 if (myNetMTUs[rxi_numNetAddrs] == 0) {
597 myNetMTUs[rxi_numNetAddrs] = OLD_MAX_PACKET_SIZE + RX_IPUDP_SIZE;
599 res = ioctl(s, SIOCGIFMTU, ifr);
600 if ((res == 0) && (ifr->ifr_metric > 128)) { /* sanity check */
601 myNetMTUs[rxi_numNetAddrs] = ifr->ifr_metric;
602 /* fprintf(stderr, "if %s mtu=%d\n",
603 * ifr->ifr_name, ifr->ifr_metric); */
605 /* fputs(stderr, "ioctl error IFMTU\n");
606 * perror(ifr->ifr_name); */
611 if (myNetMasks[rxi_numNetAddrs] == 0) {
612 myNetMasks[rxi_numNetAddrs] =
613 fudge_netmask(rxi_NetAddrs[rxi_numNetAddrs]);
614 #ifdef SIOCGIFNETMASK
615 res = ioctl(s, SIOCGIFNETMASK, ifr);
617 a = (struct sockaddr_in *)&ifr->ifr_addr;
618 myNetMasks[rxi_numNetAddrs] = ntohl(a->sin_addr.s_addr);
619 /* fprintf(stderr, "if %s subnetmask=0x%x\n",
620 * ifr->ifr_name, myNetMasks[rxi_numNetAddrs]); */
622 /* fputs(stderr, "ioctl error IFMASK\n");
623 * perror(ifr->ifr_name); */
628 if (!rx_IsLoopbackAddr(rxi_NetAddrs[rxi_numNetAddrs])) { /* ignore lo0 */
631 rxi_nRecvFrags * (myNetMTUs[rxi_numNetAddrs] - RX_IP_SIZE);
632 maxsize -= UDP_HDR_SIZE; /* only the first frag has a UDP hdr */
633 if (rx_maxReceiveSize < maxsize)
634 rx_maxReceiveSize = MIN(RX_MAX_PACKET_SIZE, maxsize);
641 /* have to allocate at least enough to allow a single packet to reach its
642 * maximum size, so ReadPacket will work. Allocate enough for a couple
643 * of packets to do so, for good measure */
645 int npackets, ncbufs;
647 rx_maxJumboRecvSize =
648 RX_HEADER_SIZE + rxi_nDgramPackets * RX_JUMBOBUFFERSIZE +
649 (rxi_nDgramPackets - 1) * RX_JUMBOHEADERSIZE;
650 rx_maxJumboRecvSize = MAX(rx_maxJumboRecvSize, rx_maxReceiveSize);
651 ncbufs = (rx_maxJumboRecvSize - RX_FIRSTBUFFERSIZE);
653 ncbufs = ncbufs / RX_CBUFFERSIZE;
654 npackets = rx_initSendWindow - 1;
655 rxi_MorePackets(npackets * (ncbufs + 1));
659 #endif /* AFS_NT40_ENV */
661 /* Called from rxi_FindPeer, when initializing a clear rx_peer structure,
662 * to get interesting information.
663 * Curiously enough, the rx_peerHashTable_lock currently protects the
664 * Inited variable (and hence rx_GetIFInfo). When the fs suite uses
665 * pthreads, this issue will need to be revisited.
669 rxi_InitPeerParams(struct rx_peer *pp)
674 #ifdef AFS_ADAPT_PMTU
676 struct sockaddr_in addr;
683 * there's a race here since more than one thread could call
684 * rx_GetIFInfo. The race stops in rx_GetIFInfo.
691 /* try to second-guess IP, and identify which link is most likely to
692 * be used for traffic to/from this host. */
693 ppaddr = ntohl(pp->host);
696 rx_rto_setPeerTimeoutSecs(pp, 2);
697 /* I don't initialize these, because I presume they are bzero'd...
698 * pp->burstSize pp->burst pp->burstWait.sec pp->burstWait.usec
702 for (ix = 0; ix < rxi_numNetAddrs; ++ix) {
703 if ((rxi_NetAddrs[ix] & myNetMasks[ix]) == (ppaddr & myNetMasks[ix])) {
704 #ifdef IFF_POINTOPOINT
705 if (myNetFlags[ix] & IFF_POINTOPOINT)
706 rx_rto_setPeerTimeoutSecs(pp, 4);
707 #endif /* IFF_POINTOPOINT */
709 rxmtu = myNetMTUs[ix] - RX_IPUDP_SIZE;
710 if (rxmtu < RX_MIN_PACKET_SIZE)
711 rxmtu = RX_MIN_PACKET_SIZE;
712 if (pp->ifMTU < rxmtu)
713 pp->ifMTU = MIN(rx_MyMaxSendSize, rxmtu);
717 if (!pp->ifMTU) { /* not local */
718 rx_rto_setPeerTimeoutSecs(pp, 3);
719 pp->ifMTU = MIN(rx_MyMaxSendSize, RX_REMOTE_PACKET_SIZE);
721 #ifdef AFS_ADAPT_PMTU
722 sock=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
723 if (sock != OSI_NULLSOCKET) {
724 addr.sin_family = AF_INET;
725 addr.sin_addr.s_addr = pp->host;
726 addr.sin_port = pp->port;
727 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) {
729 socklen_t s = sizeof(mtu);
730 if (getsockopt(sock, SOL_IP, IP_MTU, &mtu, &s)== 0) {
731 pp->ifMTU = MIN(mtu - RX_IPUDP_SIZE, pp->ifMTU);
741 pp->ifMTU = rxi_AdjustIfMTU(pp->ifMTU);
742 pp->maxMTU = OLD_MAX_PACKET_SIZE; /* for compatibility with old guys */
743 pp->natMTU = MIN((int)pp->ifMTU, OLD_MAX_PACKET_SIZE);
744 pp->maxDgramPackets =
745 MIN(rxi_nDgramPackets,
746 rxi_AdjustDgramPackets(rxi_nSendFrags, pp->ifMTU));
748 MIN(rxi_nDgramPackets,
749 rxi_AdjustDgramPackets(rxi_nSendFrags, pp->ifMTU));
750 pp->maxDgramPackets = 1;
751 /* Initialize slow start parameters */
752 pp->MTU = MIN(pp->natMTU, pp->maxMTU);
754 pp->nDgramPackets = 1;
758 /* Don't expose jumobgram internals. */
762 rx_maxReceiveSize = OLD_MAX_PACKET_SIZE;
763 rxi_nSendFrags = rxi_nRecvFrags = 1;
766 /* Override max MTU. If rx_SetNoJumbo is called, it must be
767 called before calling rx_SetMaxMTU since SetNoJumbo clobbers rx_maxReceiveSize */
769 rx_SetMaxMTU(int mtu)
771 if (mtu < RX_MIN_PACKET_SIZE || mtu > RX_MAX_PACKET_DATA_SIZE)
774 rx_MyMaxSendSize = rx_maxReceiveSizeUser = rx_maxReceiveSize = mtu;
779 #ifdef AFS_RXERRQ_ENV
781 rxi_HandleSocketError(int socket)
784 struct cmsghdr *cmsg;
785 struct sock_extended_err *err;
786 struct sockaddr_in addr;
787 char controlmsgbuf[256];
790 msg.msg_name = &addr;
791 msg.msg_namelen = sizeof(addr);
794 msg.msg_control = controlmsgbuf;
795 msg.msg_controllen = 256;
797 code = recvmsg(socket, &msg, MSG_ERRQUEUE|MSG_DONTWAIT|MSG_TRUNC);
799 if (code < 0 || !(msg.msg_flags & MSG_ERRQUEUE))
802 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
803 if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR) {
804 err = (struct sock_extended_err *)CMSG_DATA(cmsg);
805 rxi_ProcessNetError(err, addr.sin_addr.s_addr, addr.sin_port);