7ae0972c7b
Handle if arrival/departure events and VNETs. Differential Revision: https://reviews.freebsd.org/D38901 MFC after: 1 month XMFC with: ifAPI, pseudofs
357 lines
8.6 KiB
C
357 lines
8.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2023 Dmitry Chagin <dchagin@FreeBSD.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <compat/linux/linux.h>
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#include <compat/linux/linux_common.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <compat/linsysfs/linsysfs.h>
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struct pfs_node *net;
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static eventhandler_tag if_arrival_tag, if_departure_tag;
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static uint32_t net_latch_count = 0;
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static struct mtx net_latch_mtx;
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MTX_SYSINIT(net_latch_mtx, &net_latch_mtx, "lsfnet", MTX_DEF);
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struct ifp_nodes_queue {
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TAILQ_ENTRY(ifp_nodes_queue) ifp_nodes_next;
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if_t ifp;
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struct vnet *vnet;
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struct pfs_node *pn;
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};
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TAILQ_HEAD(,ifp_nodes_queue) ifp_nodes_q;
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static void
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linsysfs_net_latch_hold(void)
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{
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mtx_lock(&net_latch_mtx);
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if (net_latch_count++ > 0)
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mtx_sleep(&net_latch_count, &net_latch_mtx, PDROP, "lsfnet", 0);
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else
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mtx_unlock(&net_latch_mtx);
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}
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static void
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linsysfs_net_latch_rele(void)
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{
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mtx_lock(&net_latch_mtx);
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if (--net_latch_count > 0)
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wakeup_one(&net_latch_count);
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mtx_unlock(&net_latch_mtx);
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}
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static int
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linsysfs_if_addr(PFS_FILL_ARGS)
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{
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struct epoch_tracker et;
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struct l_sockaddr lsa;
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if_t ifp;
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int error;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_parent->pn_name);
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if (ifp != NULL && (error = linux_ifhwaddr(ifp, &lsa)) == 0)
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error = sbuf_printf(sb, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx\n",
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lsa.sa_data[0], lsa.sa_data[1], lsa.sa_data[2],
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lsa.sa_data[3], lsa.sa_data[4], lsa.sa_data[5]);
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else
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error = ENOENT;
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (error == -1 ? ERANGE : error);
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}
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static int
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linsysfs_if_addrlen(PFS_FILL_ARGS)
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{
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sbuf_printf(sb, "%d\n", LINUX_IFHWADDRLEN);
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return (0);
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}
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static int
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linsysfs_if_flags(PFS_FILL_ARGS)
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{
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struct epoch_tracker et;
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if_t ifp;
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int error;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_parent->pn_name);
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if (ifp != NULL)
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error = sbuf_printf(sb, "0x%x\n", linux_ifflags(ifp));
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else
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error = ENOENT;
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (error == -1 ? ERANGE : error);
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}
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static int
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linsysfs_if_ifindex(PFS_FILL_ARGS)
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{
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struct epoch_tracker et;
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if_t ifp;
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int error;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_parent->pn_name);
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if (ifp != NULL)
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error = sbuf_printf(sb, "%u\n", if_getindex(ifp));
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else
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error = ENOENT;
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (error == -1 ? ERANGE : error);
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}
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static int
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linsysfs_if_mtu(PFS_FILL_ARGS)
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{
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struct epoch_tracker et;
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if_t ifp;
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int error;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_parent->pn_name);
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if (ifp != NULL)
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error = sbuf_printf(sb, "%u\n", if_getmtu(ifp));
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else
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error = ENOENT;
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (error == -1 ? ERANGE : error);
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}
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static int
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linsysfs_if_txq_len(PFS_FILL_ARGS)
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{
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/* XXX */
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sbuf_printf(sb, "1000\n");
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return (0);
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}
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static int
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linsysfs_if_type(PFS_FILL_ARGS)
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{
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struct epoch_tracker et;
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struct l_sockaddr lsa;
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if_t ifp;
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int error;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_parent->pn_name);
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if (ifp != NULL && (error = linux_ifhwaddr(ifp, &lsa)) == 0)
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error = sbuf_printf(sb, "%d\n", lsa.sa_family);
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else
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error = ENOENT;
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (error == -1 ? ERANGE : error);
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}
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static int
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linsysfs_if_visible(PFS_VIS_ARGS)
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{
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struct ifp_nodes_queue *nq, *nq_tmp;
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struct epoch_tracker et;
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if_t ifp;
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int visible;
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visible = 0;
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CURVNET_SET(TD_TO_VNET(td));
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NET_EPOCH_ENTER(et);
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ifp = ifname_linux_to_ifp(td, pn->pn_name);
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if (ifp != NULL) {
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TAILQ_FOREACH_SAFE(nq, &ifp_nodes_q, ifp_nodes_next, nq_tmp) {
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if (nq->ifp == ifp && nq->vnet == curvnet) {
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visible = 1;
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break;
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}
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}
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}
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return (visible);
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}
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static int
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linsysfs_net_addif(if_t ifp, void *arg)
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{
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struct ifp_nodes_queue *nq, *nq_tmp;
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struct pfs_node *nic, *dir = arg;
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char ifname[LINUX_IFNAMSIZ];
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struct epoch_tracker et;
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int ret __diagused;
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NET_EPOCH_ENTER(et);
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ret = ifname_bsd_to_linux_ifp(ifp, ifname, sizeof(ifname));
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NET_EPOCH_EXIT(et);
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KASSERT(ret > 0, ("Interface (%s) is not converted", if_name(ifp)));
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nic = pfs_find_node(dir, ifname);
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if (nic == NULL) {
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nic = pfs_create_dir(dir, ifname, NULL, linsysfs_if_visible,
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NULL, 0);
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pfs_create_file(nic, "address", &linsysfs_if_addr,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "addr_len", &linsysfs_if_addrlen,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "flags", &linsysfs_if_flags,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "ifindex", &linsysfs_if_ifindex,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "mtu", &linsysfs_if_mtu,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "tx_queue_len", &linsysfs_if_txq_len,
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NULL, NULL, NULL, PFS_RD);
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pfs_create_file(nic, "type", &linsysfs_if_type,
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NULL, NULL, NULL, PFS_RD);
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}
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/*
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* There is a small window between registering the if_arrival
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* eventhandler and creating a list of interfaces.
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*/
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TAILQ_FOREACH_SAFE(nq, &ifp_nodes_q, ifp_nodes_next, nq_tmp) {
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if (nq->ifp == ifp && nq->vnet == curvnet)
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return (0);
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}
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nq = malloc(sizeof(*nq), M_LINSYSFS, M_WAITOK);
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nq->pn = nic;
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nq->ifp = ifp;
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nq->vnet = curvnet;
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TAILQ_INSERT_TAIL(&ifp_nodes_q, nq, ifp_nodes_next);
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return (0);
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}
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static void
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linsysfs_net_delif(if_t ifp)
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{
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struct ifp_nodes_queue *nq, *nq_tmp;
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struct pfs_node *pn;
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pn = NULL;
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TAILQ_FOREACH_SAFE(nq, &ifp_nodes_q, ifp_nodes_next, nq_tmp) {
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if (nq->ifp == ifp && nq->vnet == curvnet) {
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TAILQ_REMOVE(&ifp_nodes_q, nq, ifp_nodes_next);
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pn = nq->pn;
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free(nq, M_LINSYSFS);
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break;
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}
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}
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if (pn == NULL)
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return;
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TAILQ_FOREACH_SAFE(nq, &ifp_nodes_q, ifp_nodes_next, nq_tmp) {
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if (nq->pn == pn)
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return;
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}
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pfs_destroy(pn);
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}
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static void
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linsysfs_if_arrival(void *arg __unused, if_t ifp)
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{
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linsysfs_net_latch_hold();
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(void)linsysfs_net_addif(ifp, net);
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linsysfs_net_latch_rele();
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}
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static void
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linsysfs_if_departure(void *arg __unused, if_t ifp)
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{
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linsysfs_net_latch_hold();
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linsysfs_net_delif(ifp);
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linsysfs_net_latch_rele();
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}
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void
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linsysfs_net_init(void)
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{
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VNET_ITERATOR_DECL(vnet_iter);
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MPASS(net != NULL);
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TAILQ_INIT(&ifp_nodes_q);
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if_arrival_tag = EVENTHANDLER_REGISTER(ifnet_arrival_event,
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linsysfs_if_arrival, NULL, EVENTHANDLER_PRI_ANY);
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if_departure_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
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linsysfs_if_departure, NULL, EVENTHANDLER_PRI_ANY);
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linsysfs_net_latch_hold();
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VNET_LIST_RLOCK();
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VNET_FOREACH(vnet_iter) {
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CURVNET_SET(vnet_iter);
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if_foreach_sleep(NULL, NULL, linsysfs_net_addif, net);
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CURVNET_RESTORE();
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}
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VNET_LIST_RUNLOCK();
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linsysfs_net_latch_rele();
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}
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void
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linsysfs_net_uninit(void)
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{
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struct ifp_nodes_queue *nq, *nq_tmp;
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EVENTHANDLER_DEREGISTER(ifnet_arrival_event, if_arrival_tag);
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EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_departure_tag);
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linsysfs_net_latch_hold();
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TAILQ_FOREACH_SAFE(nq, &ifp_nodes_q, ifp_nodes_next, nq_tmp) {
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TAILQ_REMOVE(&ifp_nodes_q, nq, ifp_nodes_next);
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free(nq, M_LINSYSFS);
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}
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linsysfs_net_latch_rele();
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}
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