Since 4.4BSD the protosw was used to implement socket types created by socket(2) syscall and at the same to demultiplex incoming IPv4 datagrams (later copied to IPv6). This story ended with78b1fc05b2
. These entries (e.g. IPPROTO_ICMP) in inetsw that were added to catch packets in ip_input(), they would also be returned by pffindproto() if user says socket(AF_INET, SOCK_RAW, IPPROTO_ICMP). Thus, for raw sockets to work correctly, all the entries were pointing at raw_usrreq differentiating only in the value of pr_protocol. With78b1fc05b2
all these entries are no longer needed, as ip_protox is independent of protosw. Any socket syscall requesting SOCK_RAW type would end up with rip_protosw. And this protosw has its pr_protocol set to 0, allowing to mark socket with any protocol. For IPv6 raw socket the change required two small fixes: o Validate user provided protocol value o Always use protocol number stored in inp in rip6_attach, instead of protosw value, which is now always 0. Differential revision: https://reviews.freebsd.org/D36380
397 lines
9.0 KiB
C
397 lines
9.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. 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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* 3. 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_domain.c 8.2 (Berkeley) 10/18/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/eventhandler.h>
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#include <sys/epoch.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/rmlock.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <machine/atomic.h>
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#include <net/vnet.h>
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struct domainhead domains = SLIST_HEAD_INITIALIZER(&domains);
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int domain_init_status = 1;
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static struct mtx dom_mtx; /* domain list lock */
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MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
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static int
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pr_accept_notsupp(struct socket *so, struct sockaddr **nam)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_aio_queue_notsupp(struct socket *so, struct kaiocb *job)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_bind_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_bindat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
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struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_connect_notsupp(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_connectat_notsupp(int fd, struct socket *so, struct sockaddr *nam,
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struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_connect2_notsupp(struct socket *so1, struct socket *so2)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_control_notsupp(struct socket *so, u_long cmd, void *data,
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struct ifnet *ifp, struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_disconnect_notsupp(struct socket *so)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_listen_notsupp(struct socket *so, int backlog, struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_peeraddr_notsupp(struct socket *so, struct sockaddr **nam)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_rcvd_notsupp(struct socket *so, int flags)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_send_notsupp(struct socket *so, int flags, struct mbuf *m,
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struct sockaddr *addr, struct mbuf *control, struct thread *td)
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{
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if (control != NULL)
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m_freem(control);
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if ((flags & PRUS_NOTREADY) == 0)
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m_freem(m);
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return (EOPNOTSUPP);
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}
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static int
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pr_ready_notsupp(struct socket *so, struct mbuf *m, int count)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_shutdown_notsupp(struct socket *so)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_sockaddr_notsupp(struct socket *so, struct sockaddr **nam)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_sosend_notsupp(struct socket *so, struct sockaddr *addr, struct uio *uio,
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struct mbuf *top, struct mbuf *control, int flags, struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
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struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
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{
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return (EOPNOTSUPP);
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}
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static int
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pr_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
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struct thread *td)
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{
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return (EOPNOTSUPP);
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}
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static void
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pr_init(struct domain *dom, struct protosw *pr)
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{
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KASSERT(pr->pr_attach != NULL,
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("%s: protocol doesn't have pr_attach", __func__));
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pr->pr_domain = dom;
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#define DEFAULT(foo, bar) if (pr->foo == NULL) pr->foo = bar
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DEFAULT(pr_sosend, sosend_generic);
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DEFAULT(pr_soreceive, soreceive_generic);
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DEFAULT(pr_sopoll, sopoll_generic);
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#define NOTSUPP(foo) if (pr->foo == NULL) pr->foo = foo ## _notsupp
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NOTSUPP(pr_accept);
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NOTSUPP(pr_aio_queue);
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NOTSUPP(pr_bind);
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NOTSUPP(pr_bindat);
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NOTSUPP(pr_connect);
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NOTSUPP(pr_connect2);
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NOTSUPP(pr_connectat);
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NOTSUPP(pr_control);
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NOTSUPP(pr_disconnect);
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NOTSUPP(pr_listen);
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NOTSUPP(pr_peeraddr);
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NOTSUPP(pr_rcvd);
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NOTSUPP(pr_rcvoob);
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NOTSUPP(pr_send);
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NOTSUPP(pr_shutdown);
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NOTSUPP(pr_sockaddr);
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NOTSUPP(pr_sosend);
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NOTSUPP(pr_soreceive);
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NOTSUPP(pr_sopoll);
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NOTSUPP(pr_ready);
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}
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/*
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* Add a new protocol domain to the list of supported domains
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* Note: you cant unload it again because a socket may be using it.
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* XXX can't fail at this time.
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*/
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void
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domain_add(struct domain *dp)
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{
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struct protosw *pr;
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MPASS(IS_DEFAULT_VNET(curvnet));
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if (dp->dom_probe != NULL && (*dp->dom_probe)() != 0)
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return;
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for (int i = 0; i < dp->dom_nprotosw; i++)
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if ((pr = dp->dom_protosw[i]) != NULL)
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pr_init(dp, pr);
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mtx_lock(&dom_mtx);
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#ifdef INVARIANTS
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struct domain *tmp;
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SLIST_FOREACH(tmp, &domains, dom_next)
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MPASS(tmp->dom_family != dp->dom_family);
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#endif
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SLIST_INSERT_HEAD(&domains, dp, dom_next);
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mtx_unlock(&dom_mtx);
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}
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void
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domain_remove(struct domain *dp)
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{
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if ((dp->dom_flags & DOMF_UNLOADABLE) == 0)
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return;
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mtx_lock(&dom_mtx);
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SLIST_REMOVE(&domains, dp, domain, dom_next);
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mtx_unlock(&dom_mtx);
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}
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static void
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domainfinalize(void *dummy)
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{
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mtx_lock(&dom_mtx);
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KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
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domain_init_status = 2;
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mtx_unlock(&dom_mtx);
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}
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SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
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NULL);
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struct domain *
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pffinddomain(int family)
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{
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struct domain *dp;
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SLIST_FOREACH(dp, &domains, dom_next)
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if (dp->dom_family == family)
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return (dp);
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return (NULL);
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}
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struct protosw *
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pffindtype(int family, int type)
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{
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struct domain *dp;
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struct protosw *pr;
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dp = pffinddomain(family);
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if (dp == NULL)
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return (NULL);
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for (int i = 0; i < dp->dom_nprotosw; i++)
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if ((pr = dp->dom_protosw[i]) != NULL && pr->pr_type == type)
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return (pr);
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return (NULL);
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}
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/*
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* The caller must make sure that the new protocol is fully set up and ready to
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* accept requests before it is registered.
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*/
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int
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protosw_register(struct domain *dp, struct protosw *npr)
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{
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struct protosw **prp;
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MPASS(dp);
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MPASS(npr && npr->pr_type > 0 && npr->pr_protocol > 0);
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prp = NULL;
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/*
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* Protect us against races when two protocol registrations for
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* the same protocol happen at the same time.
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*/
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mtx_lock(&dom_mtx);
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for (int i = 0; i < dp->dom_nprotosw; i++) {
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if (dp->dom_protosw[i] == NULL) {
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/* Remember the first free spacer. */
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if (prp == NULL)
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prp = &dp->dom_protosw[i];
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} else {
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/*
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* The new protocol must not yet exist.
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* XXXAO: Check only protocol?
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* XXXGL: Maybe assert that it doesn't exist?
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*/
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if ((dp->dom_protosw[i]->pr_type == npr->pr_type) &&
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(dp->dom_protosw[i]->pr_protocol ==
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npr->pr_protocol)) {
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mtx_unlock(&dom_mtx);
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return (EEXIST);
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}
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}
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}
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/* If no free spacer is found we can't add the new protocol. */
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if (prp == NULL) {
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mtx_unlock(&dom_mtx);
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return (ENOMEM);
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}
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pr_init(dp, npr);
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*prp = npr;
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mtx_unlock(&dom_mtx);
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return (0);
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}
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/*
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* The caller must make sure the protocol and its functions correctly shut down
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* all sockets and release all locks and memory references.
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*/
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int
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protosw_unregister(struct protosw *pr)
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{
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struct domain *dp;
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struct protosw **prp;
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dp = pr->pr_domain;
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prp = NULL;
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mtx_lock(&dom_mtx);
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/* The protocol must exist and only once. */
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for (int i = 0; i < dp->dom_nprotosw; i++) {
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if (dp->dom_protosw[i] == pr) {
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KASSERT(prp == NULL,
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("%s: domain %p protocol %p registered twice\n",
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__func__, dp, pr));
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prp = &dp->dom_protosw[i];
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}
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}
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/* Protocol does not exist. XXXGL: assert that it does? */
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if (prp == NULL) {
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mtx_unlock(&dom_mtx);
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return (EPROTONOSUPPORT);
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}
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/* De-orbit the protocol and make the slot available again. */
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*prp = NULL;
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mtx_unlock(&dom_mtx);
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return (0);
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}
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