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* 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);
}
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