--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+#define DEBUG_SUBSYSTEM S_LNET
+#include "../../include/linux/lnet/lib-lnet.h"
+
+
+static int accept_port = 988;
+static int accept_backlog = 127;
+static int accept_timeout = 5;
+
+static struct {
+ int pta_shutdown;
+ struct socket *pta_sock;
+ struct completion pta_signal;
+} lnet_acceptor_state;
+
+int
+lnet_acceptor_port(void)
+{
+ return accept_port;
+}
+EXPORT_SYMBOL(lnet_acceptor_port);
+
+static inline int
+lnet_accept_magic(__u32 magic, __u32 constant)
+{
+ return (magic == constant ||
+ magic == __swab32(constant));
+}
+
+static char *accept = "secure";
+
+module_param(accept, charp, 0444);
+MODULE_PARM_DESC(accept, "Accept connections (secure|all|none)");
+module_param(accept_port, int, 0444);
+MODULE_PARM_DESC(accept_port, "Acceptor's port (same on all nodes)");
+module_param(accept_backlog, int, 0444);
+MODULE_PARM_DESC(accept_backlog, "Acceptor's listen backlog");
+module_param(accept_timeout, int, 0644);
+MODULE_PARM_DESC(accept_timeout, "Acceptor's timeout (seconds)");
+
+static char *accept_type;
+
+static int
+lnet_acceptor_get_tunables(void)
+{
+ /* Userland acceptor uses 'accept_type' instead of 'accept', due to
+ * conflict with 'accept(2)', but kernel acceptor still uses 'accept'
+ * for compatibility. Hence the trick. */
+ accept_type = accept;
+ return 0;
+}
+
+int
+lnet_acceptor_timeout(void)
+{
+ return accept_timeout;
+}
+EXPORT_SYMBOL(lnet_acceptor_timeout);
+
+void
+lnet_connect_console_error(int rc, lnet_nid_t peer_nid,
+ __u32 peer_ip, int peer_port)
+{
+ switch (rc) {
+ /* "normal" errors */
+ case -ECONNREFUSED:
+ CNETERR("Connection to %s at host %pI4h on port %d was refused: check that Lustre is running on that node.\n",
+ libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port);
+ break;
+ case -EHOSTUNREACH:
+ case -ENETUNREACH:
+ CNETERR("Connection to %s at host %pI4h was unreachable: the network or that node may be down, or Lustre may be misconfigured.\n",
+ libcfs_nid2str(peer_nid), &peer_ip);
+ break;
+ case -ETIMEDOUT:
+ CNETERR("Connection to %s at host %pI4h on port %d took too long: that node may be hung or experiencing high load.\n",
+ libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port);
+ break;
+ case -ECONNRESET:
+ LCONSOLE_ERROR_MSG(0x11b, "Connection to %s at host %pI4h on port %d was reset: is it running a compatible version of Lustre and is %s one of its NIDs?\n",
+ libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port,
+ libcfs_nid2str(peer_nid));
+ break;
+ case -EPROTO:
+ LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at host %pI4h on port %d: is it running a compatible version of Lustre?\n",
+ libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port);
+ break;
+ case -EADDRINUSE:
+ LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to connect to %s at host %pI4h on port %d\n",
+ libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port);
+ break;
+ default:
+ LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s at host %pI4h on port %d\n",
+ rc, libcfs_nid2str(peer_nid),
+ &peer_ip, peer_port);
+ break;
+ }
+}
+EXPORT_SYMBOL(lnet_connect_console_error);
+
+int
+lnet_connect(struct socket **sockp, lnet_nid_t peer_nid,
+ __u32 local_ip, __u32 peer_ip, int peer_port)
+{
+ lnet_acceptor_connreq_t cr;
+ struct socket *sock;
+ int rc;
+ int port;
+ int fatal;
+
+ CLASSERT(sizeof(cr) <= 16); /* not too big to be on the stack */
+
+ for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT;
+ port >= LNET_ACCEPTOR_MIN_RESERVED_PORT;
+ --port) {
+ /* Iterate through reserved ports. */
+
+ rc = libcfs_sock_connect(&sock, &fatal,
+ local_ip, port,
+ peer_ip, peer_port);
+ if (rc != 0) {
+ if (fatal)
+ goto failed;
+ continue;
+ }
+
+ CLASSERT(LNET_PROTO_ACCEPTOR_VERSION == 1);
+
+ cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
+ cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
+ cr.acr_nid = peer_nid;
+
+ if (the_lnet.ln_testprotocompat != 0) {
+ /* single-shot proto check */
+ lnet_net_lock(LNET_LOCK_EX);
+ if ((the_lnet.ln_testprotocompat & 4) != 0) {
+ cr.acr_version++;
+ the_lnet.ln_testprotocompat &= ~4;
+ }
+ if ((the_lnet.ln_testprotocompat & 8) != 0) {
+ cr.acr_magic = LNET_PROTO_MAGIC;
+ the_lnet.ln_testprotocompat &= ~8;
+ }
+ lnet_net_unlock(LNET_LOCK_EX);
+ }
+
+ rc = libcfs_sock_write(sock, &cr, sizeof(cr),
+ accept_timeout);
+ if (rc != 0)
+ goto failed_sock;
+
+ *sockp = sock;
+ return 0;
+ }
+
+ rc = -EADDRINUSE;
+ goto failed;
+
+ failed_sock:
+ libcfs_sock_release(sock);
+ failed:
+ lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port);
+ return rc;
+}
+EXPORT_SYMBOL(lnet_connect);
+
+
+/* Below is the code common for both kernel and MT user-space */
+
+static int
+lnet_accept(struct socket *sock, __u32 magic)
+{
+ lnet_acceptor_connreq_t cr;
+ __u32 peer_ip;
+ int peer_port;
+ int rc;
+ int flip;
+ lnet_ni_t *ni;
+ char *str;
+
+ LASSERT(sizeof(cr) <= 16); /* not too big for the stack */
+
+ rc = libcfs_sock_getaddr(sock, 1, &peer_ip, &peer_port);
+ LASSERT(rc == 0); /* we succeeded before */
+
+ if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) {
+
+ if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) {
+ /* future version compatibility!
+ * When LNET unifies protocols over all LNDs, the first
+ * thing sent will be a version query. I send back
+ * LNET_PROTO_ACCEPTOR_MAGIC to tell her I'm "old" */
+
+ memset(&cr, 0, sizeof(cr));
+ cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
+ cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
+ rc = libcfs_sock_write(sock, &cr, sizeof(cr),
+ accept_timeout);
+
+ if (rc != 0)
+ CERROR("Error sending magic+version in response to LNET magic from %pI4h: %d\n",
+ &peer_ip, rc);
+ return -EPROTO;
+ }
+
+ if (magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC))
+ str = "'old' socknal/tcpnal";
+ else if (lnet_accept_magic(magic, LNET_PROTO_RA_MAGIC))
+ str = "'old' ranal";
+ else
+ str = "unrecognised";
+
+ LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %pI4h magic %08x: %s acceptor protocol\n",
+ &peer_ip, magic, str);
+ return -EPROTO;
+ }
+
+ flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC);
+
+ rc = libcfs_sock_read(sock, &cr.acr_version,
+ sizeof(cr.acr_version),
+ accept_timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading connection request version from %pI4h\n",
+ rc, &peer_ip);
+ return -EIO;
+ }
+
+ if (flip)
+ __swab32s(&cr.acr_version);
+
+ if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) {
+ /* future version compatibility!
+ * An acceptor-specific protocol rev will first send a version
+ * query. I send back my current version to tell her I'm
+ * "old". */
+ int peer_version = cr.acr_version;
+
+ memset(&cr, 0, sizeof(cr));
+ cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
+ cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
+
+ rc = libcfs_sock_write(sock, &cr, sizeof(cr),
+ accept_timeout);
+
+ if (rc != 0)
+ CERROR("Error sending magic+version in response to version %d from %pI4h: %d\n",
+ peer_version, &peer_ip, rc);
+ return -EPROTO;
+ }
+
+ rc = libcfs_sock_read(sock, &cr.acr_nid,
+ sizeof(cr) -
+ offsetof(lnet_acceptor_connreq_t, acr_nid),
+ accept_timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading connection request from %pI4h\n",
+ rc, &peer_ip);
+ return -EIO;
+ }
+
+ if (flip)
+ __swab64s(&cr.acr_nid);
+
+ ni = lnet_net2ni(LNET_NIDNET(cr.acr_nid));
+ if (ni == NULL || /* no matching net */
+ ni->ni_nid != cr.acr_nid) { /* right NET, wrong NID! */
+ if (ni != NULL)
+ lnet_ni_decref(ni);
+ LCONSOLE_ERROR_MSG(0x120, "Refusing connection from %pI4h for %s: No matching NI\n",
+ &peer_ip, libcfs_nid2str(cr.acr_nid));
+ return -EPERM;
+ }
+
+ if (ni->ni_lnd->lnd_accept == NULL) {
+ /* This catches a request for the loopback LND */
+ lnet_ni_decref(ni);
+ LCONSOLE_ERROR_MSG(0x121, "Refusing connection from %pI4h for %s: NI doesn not accept IP connections\n",
+ &peer_ip, libcfs_nid2str(cr.acr_nid));
+ return -EPERM;
+ }
+
+ CDEBUG(D_NET, "Accept %s from %pI4h\n",
+ libcfs_nid2str(cr.acr_nid), &peer_ip);
+
+ rc = ni->ni_lnd->lnd_accept(ni, sock);
+
+ lnet_ni_decref(ni);
+ return rc;
+}
+
+static int
+lnet_acceptor(void *arg)
+{
+ struct socket *newsock;
+ int rc;
+ __u32 magic;
+ __u32 peer_ip;
+ int peer_port;
+ int secure = (int)((long_ptr_t)arg);
+
+ LASSERT(lnet_acceptor_state.pta_sock == NULL);
+
+ cfs_block_allsigs();
+
+ rc = libcfs_sock_listen(&lnet_acceptor_state.pta_sock,
+ 0, accept_port, accept_backlog);
+ if (rc != 0) {
+ if (rc == -EADDRINUSE)
+ LCONSOLE_ERROR_MSG(0x122, "Can't start acceptor on port %d: port already in use\n",
+ accept_port);
+ else
+ LCONSOLE_ERROR_MSG(0x123, "Can't start acceptor on port %d: unexpected error %d\n",
+ accept_port, rc);
+
+ lnet_acceptor_state.pta_sock = NULL;
+ } else {
+ LCONSOLE(0, "Accept %s, port %d\n", accept_type, accept_port);
+ }
+
+ /* set init status and unblock parent */
+ lnet_acceptor_state.pta_shutdown = rc;
+ complete(&lnet_acceptor_state.pta_signal);
+
+ if (rc != 0)
+ return rc;
+
+ while (!lnet_acceptor_state.pta_shutdown) {
+
+ rc = libcfs_sock_accept(&newsock, lnet_acceptor_state.pta_sock);
+ if (rc != 0) {
+ if (rc != -EAGAIN) {
+ CWARN("Accept error %d: pausing...\n", rc);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(1));
+ }
+ continue;
+ }
+
+ /* maybe we're waken up with libcfs_sock_abort_accept() */
+ if (lnet_acceptor_state.pta_shutdown) {
+ libcfs_sock_release(newsock);
+ break;
+ }
+
+ rc = libcfs_sock_getaddr(newsock, 1, &peer_ip, &peer_port);
+ if (rc != 0) {
+ CERROR("Can't determine new connection's address\n");
+ goto failed;
+ }
+
+ if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
+ CERROR("Refusing connection from %pI4h: insecure port %d\n",
+ &peer_ip, peer_port);
+ goto failed;
+ }
+
+ rc = libcfs_sock_read(newsock, &magic, sizeof(magic),
+ accept_timeout);
+ if (rc != 0) {
+ CERROR("Error %d reading connection request from %pI4h\n",
+ rc, &peer_ip);
+ goto failed;
+ }
+
+ rc = lnet_accept(newsock, magic);
+ if (rc != 0)
+ goto failed;
+
+ continue;
+
+failed:
+ libcfs_sock_release(newsock);
+ }
+
+ libcfs_sock_release(lnet_acceptor_state.pta_sock);
+ lnet_acceptor_state.pta_sock = NULL;
+
+ CDEBUG(D_NET, "Acceptor stopping\n");
+
+ /* unblock lnet_acceptor_stop() */
+ complete(&lnet_acceptor_state.pta_signal);
+ return 0;
+}
+
+static inline int
+accept2secure(const char *acc, long *sec)
+{
+ if (!strcmp(acc, "secure")) {
+ *sec = 1;
+ return 1;
+ } else if (!strcmp(acc, "all")) {
+ *sec = 0;
+ return 1;
+ } else if (!strcmp(acc, "none")) {
+ return 0;
+ }
+
+ LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n",
+ acc);
+ return -EINVAL;
+}
+
+int
+lnet_acceptor_start(void)
+{
+ int rc;
+ long rc2;
+ long secure;
+
+ LASSERT(lnet_acceptor_state.pta_sock == NULL);
+
+ rc = lnet_acceptor_get_tunables();
+ if (rc != 0)
+ return rc;
+
+
+ init_completion(&lnet_acceptor_state.pta_signal);
+ rc = accept2secure(accept_type, &secure);
+ if (rc <= 0)
+ return rc;
+
+ if (lnet_count_acceptor_nis() == 0) /* not required */
+ return 0;
+
+ rc2 = PTR_ERR(kthread_run(lnet_acceptor,
+ (void *)(ulong_ptr_t)secure,
+ "acceptor_%03ld", secure));
+ if (IS_ERR_VALUE(rc2)) {
+ CERROR("Can't start acceptor thread: %ld\n", rc2);
+
+ return -ESRCH;
+ }
+
+ /* wait for acceptor to startup */
+ wait_for_completion(&lnet_acceptor_state.pta_signal);
+
+ if (!lnet_acceptor_state.pta_shutdown) {
+ /* started OK */
+ LASSERT(lnet_acceptor_state.pta_sock != NULL);
+ return 0;
+ }
+
+ LASSERT(lnet_acceptor_state.pta_sock == NULL);
+
+ return -ENETDOWN;
+}
+
+void
+lnet_acceptor_stop(void)
+{
+ if (lnet_acceptor_state.pta_sock == NULL) /* not running */
+ return;
+
+ lnet_acceptor_state.pta_shutdown = 1;
+ libcfs_sock_abort_accept(lnet_acceptor_state.pta_sock);
+
+ /* block until acceptor signals exit */
+ wait_for_completion(&lnet_acceptor_state.pta_signal);
+}
Code Review / kvmfornfv.git / blobdiff