freebsd-skq/sys/dev/iscsi/icl_soft_proxy.c
trasz 599489dd16 Rename icl_proxy.c to icl_soft_proxy.c, to make it clear it's a part
of software ICL backend.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
2016-05-17 15:21:17 +00:00

376 lines
9.9 KiB
C

/*-
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*-
* Copyright (c) 1982, 1986, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* sendfile(2) and related extensions:
* Copyright (c) 1998, David Greenman. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
*/
/*
* iSCSI Common Layer, kernel proxy part.
*/
#ifdef ICL_KERNEL_PROXY
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/systm.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <dev/iscsi/icl.h>
struct icl_listen_sock {
TAILQ_ENTRY(icl_listen_sock) ils_next;
struct icl_listen *ils_listen;
struct socket *ils_socket;
bool ils_running;
bool ils_disconnecting;
int ils_id;
};
struct icl_listen {
TAILQ_HEAD(, icl_listen_sock) il_sockets;
struct sx il_lock;
void (*il_accept)(struct socket *,
struct sockaddr *, int);
};
static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
int
icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype,
int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
{
struct socket *so;
int error;
int interrupted = 0;
error = socreate(domain, &so, socktype, protocol,
curthread->td_ucred, curthread);
if (error != 0)
return (error);
if (from_sa != NULL) {
error = sobind(so, from_sa, curthread);
if (error != 0) {
soclose(so);
return (error);
}
}
error = soconnect(so, to_sa, curthread);
if (error != 0) {
soclose(so);
return (error);
}
SOCK_LOCK(so);
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
"icl_connect", 0);
if (error) {
if (error == EINTR || error == ERESTART)
interrupted = 1;
break;
}
}
if (error == 0) {
error = so->so_error;
so->so_error = 0;
}
SOCK_UNLOCK(so);
if (error != 0) {
soclose(so);
return (error);
}
error = icl_soft_handoff_sock(ic, so);
if (error != 0)
soclose(so);
return (error);
}
struct icl_listen *
icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int))
{
struct icl_listen *il;
il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
TAILQ_INIT(&il->il_sockets);
sx_init(&il->il_lock, "icl_listen");
il->il_accept = accept_cb;
return (il);
}
void
icl_listen_free(struct icl_listen *il)
{
struct icl_listen_sock *ils;
sx_xlock(&il->il_lock);
while (!TAILQ_EMPTY(&il->il_sockets)) {
ils = TAILQ_FIRST(&il->il_sockets);
while (ils->ils_running) {
ICL_DEBUG("waiting for accept thread to terminate");
sx_xunlock(&il->il_lock);
ils->ils_disconnecting = true;
wakeup(&ils->ils_socket->so_timeo);
pause("icl_unlisten", 1 * hz);
sx_xlock(&il->il_lock);
}
TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
soclose(ils->ils_socket);
free(ils, M_ICL_PROXY);
}
sx_xunlock(&il->il_lock);
free(il, M_ICL_PROXY);
}
/*
* XXX: Doing accept in a separate thread in each socket might not be the best way
* to do stuff, but it's pretty clean and debuggable - and you probably won't
* have hundreds of listening sockets anyway.
*/
static void
icl_accept_thread(void *arg)
{
struct icl_listen_sock *ils;
struct socket *head, *so;
struct sockaddr *sa;
int error;
ils = arg;
head = ils->ils_socket;
ils->ils_running = true;
for (;;) {
ACCEPT_LOCK();
while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0 && ils->ils_disconnecting == false) {
if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
head->so_error = ECONNABORTED;
break;
}
error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH,
"accept", 0);
if (error) {
ACCEPT_UNLOCK();
ICL_WARN("msleep failed with error %d", error);
continue;
}
if (ils->ils_disconnecting) {
ACCEPT_UNLOCK();
ICL_DEBUG("terminating");
ils->ils_running = false;
kthread_exit();
return;
}
}
if (head->so_error) {
error = head->so_error;
head->so_error = 0;
ACCEPT_UNLOCK();
ICL_WARN("socket error %d", error);
continue;
}
so = TAILQ_FIRST(&head->so_comp);
KASSERT(so != NULL, ("NULL so"));
KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));
/*
* Before changing the flags on the socket, we have to bump the
* reference count. Otherwise, if the protocol calls sofree(),
* the socket will be released due to a zero refcount.
*/
SOCK_LOCK(so); /* soref() and so_state update */
soref(so); /* file descriptor reference */
TAILQ_REMOVE(&head->so_comp, so, so_list);
head->so_qlen--;
so->so_state |= (head->so_state & SS_NBIO);
so->so_qstate &= ~SQ_COMP;
so->so_head = NULL;
SOCK_UNLOCK(so);
ACCEPT_UNLOCK();
sa = NULL;
error = soaccept(so, &sa);
if (error != 0) {
ICL_WARN("soaccept error %d", error);
if (sa != NULL)
free(sa, M_SONAME);
soclose(so);
continue;
}
(ils->ils_listen->il_accept)(so, sa, ils->ils_id);
}
}
static int
icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype,
int protocol, struct sockaddr *sa, int portal_id)
{
struct icl_listen_sock *ils;
struct socket *so;
struct sockopt sopt;
int error, one = 1;
error = socreate(domain, &so, socktype, protocol,
curthread->td_ucred, curthread);
if (error != 0) {
ICL_WARN("socreate failed with error %d", error);
return (error);
}
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = SOL_SOCKET;
sopt.sopt_name = SO_REUSEADDR;
sopt.sopt_val = &one;
sopt.sopt_valsize = sizeof(one);
sopt.sopt_td = NULL;
error = sosetopt(so, &sopt);
if (error != 0) {
ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
soclose(so);
return (error);
}
error = sobind(so, sa, curthread);
if (error != 0) {
ICL_WARN("sobind failed with error %d", error);
soclose(so);
return (error);
}
error = solisten(so, -1, curthread);
if (error != 0) {
ICL_WARN("solisten failed with error %d", error);
soclose(so);
return (error);
}
ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
ils->ils_listen = il;
ils->ils_socket = so;
ils->ils_id = portal_id;
error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
if (error != 0) {
ICL_WARN("kthread_add failed with error %d", error);
soclose(so);
free(ils, M_ICL_PROXY);
return (error);
}
sx_xlock(&il->il_lock);
TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
sx_xunlock(&il->il_lock);
return (0);
}
int
icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype,
int protocol, struct sockaddr *sa, int portal_id)
{
if (rdma) {
ICL_DEBUG("RDMA not supported");
return (EOPNOTSUPP);
}
return (icl_listen_add_tcp(il, domain, socktype, protocol, sa,
portal_id));
}
int
icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
{
/*
* XXX
*/
return (EOPNOTSUPP);
}
#endif /* ICL_KERNEL_PROXY */