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