240 lines
6.5 KiB
C
240 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
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* 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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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/ucred.h>
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#include <sys/jail.h>
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#include <sys/sockio.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/callout.h>
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#include <sys/endian.h>
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#include <sys/kthread.h>
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#include <sys/taskqueue.h>
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#include <sys/priv.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net/vnet.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_regdomain.h>
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#include <net/bpf.h>
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#include <sys/errno.h>
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#include <sys/conf.h> /* cdevsw struct */
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#include <sys/uio.h> /* uio struct */
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include "visibility.h"
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/* Function prototypes */
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static d_ioctl_t vis_ioctl;
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static struct cdevsw vis_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = 0,
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.d_ioctl = vis_ioctl,
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.d_name = "visctl",
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};
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void
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visibility_init(struct wtap_plugin *plugin)
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{
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struct visibility_plugin *vis_plugin;
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vis_plugin = (struct visibility_plugin *) plugin;
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plugin->wp_sdev = make_dev(&vis_cdevsw,0,UID_ROOT,GID_WHEEL,0600,
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(const char *)"visctl");
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plugin->wp_sdev->si_drv1 = vis_plugin;
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mtx_init(&vis_plugin->pl_mtx, "visibility_plugin mtx",
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NULL, MTX_DEF | MTX_RECURSE);
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printf("Using visibility wtap plugin...\n");
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}
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void
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visibility_deinit(struct wtap_plugin *plugin)
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{
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struct visibility_plugin *vis_plugin;
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vis_plugin = (struct visibility_plugin *) plugin;
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destroy_dev(plugin->wp_sdev);
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mtx_destroy(&vis_plugin->pl_mtx);
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free(vis_plugin, M_WTAP_PLUGIN);
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printf("Removing visibility wtap plugin...\n");
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}
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/* We need to use a mutex lock when we read out a visibility map
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* and when we change visibility map from user space through IOCTL
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*/
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void
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visibility_work(struct wtap_plugin *plugin, struct packet *p)
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{
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struct visibility_plugin *vis_plugin =
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(struct visibility_plugin *) plugin;
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struct wtap_hal *hal = (struct wtap_hal *)vis_plugin->base.wp_hal;
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struct vis_map *map;
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KASSERT(mtod(p->m, const char *) != (const char *) 0xdeadc0de ||
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mtod(p->m, const char *) != NULL,
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("[%s] got a corrupt packet from master queue, p->m=%p, p->id=%d\n",
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__func__, p->m, p->id));
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DWTAP_PRINTF("[%d] BROADCASTING m=%p\n", p->id, p->m);
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mtx_lock(&vis_plugin->pl_mtx);
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map = &vis_plugin->pl_node[p->id];
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mtx_unlock(&vis_plugin->pl_mtx);
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/* This is O(n*n) which is not optimal for large
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* number of nodes. Another way of doing it is
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* creating groups of nodes that hear each other.
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* Atleast for this simple static node plugin.
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*/
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for(int i=0; i<ARRAY_SIZE; ++i){
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uint32_t index = map->map[i];
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for(int j=0; j<32; ++j){
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int vis = index & 0x01;
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if(vis){
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int k = i*ARRAY_SIZE + j;
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if(hal->hal_devs[k] != NULL
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&& hal->hal_devs[k]->up == 1){
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struct wtap_softc *sc =
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hal->hal_devs[k];
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struct mbuf *m =
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m_dup(p->m, M_NOWAIT);
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DWTAP_PRINTF("[%d] duplicated old_m=%p"
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"to new_m=%p\n", p->id, p->m, m);
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#if 0
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printf("[%d] sending to %d\n",
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p->id, k);
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#endif
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wtap_inject(sc, m);
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}
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}
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index = index >> 1;
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}
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}
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}
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static void
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add_link(struct visibility_plugin *vis_plugin, struct link *l)
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{
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mtx_lock(&vis_plugin->pl_mtx);
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struct vis_map *map = &vis_plugin->pl_node[l->id1];
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int index = l->id2/ARRAY_SIZE;
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int bit = l->id2 % ARRAY_SIZE;
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uint32_t value = 1 << bit;
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map->map[index] = map->map[index] | value;
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mtx_unlock(&vis_plugin->pl_mtx);
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#if 0
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printf("l->id1=%d, l->id2=%d, map->map[%d] = %u, bit=%d\n",
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l->id1, l->id2, index, map->map[index], bit);
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#endif
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}
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static void
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del_link(struct visibility_plugin *vis_plugin, struct link *l)
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{
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mtx_lock(&vis_plugin->pl_mtx);
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struct vis_map *map = &vis_plugin->pl_node[l->id1];
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int index = l->id2/ARRAY_SIZE;
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int bit = l->id2 % ARRAY_SIZE;
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uint32_t value = 1 << bit;
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map->map[index] = map->map[index] & ~value;
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mtx_unlock(&vis_plugin->pl_mtx);
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#if 0
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printf("map->map[index] = %u\n", map->map[index]);
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#endif
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}
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int
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vis_ioctl(struct cdev *sdev, u_long cmd, caddr_t data,
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int fflag, struct thread *td)
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{
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struct visibility_plugin *vis_plugin =
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(struct visibility_plugin *) sdev->si_drv1;
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struct wtap_hal *hal = vis_plugin->base.wp_hal;
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struct link l;
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int op;
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int error = 0;
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CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
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switch(cmd) {
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case VISIOCTLOPEN:
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op = *(int *)data;
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if(op == 0)
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medium_close(hal->hal_md);
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else
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medium_open(hal->hal_md);
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break;
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case VISIOCTLLINK:
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l = *(struct link *)data;
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if(l.op == 0)
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del_link(vis_plugin, &l);
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else
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add_link(vis_plugin, &l);
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#if 0
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printf("op=%d, id1=%d, id2=%d\n", l.op, l.id1, l.id2);
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#endif
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break;
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default:
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DWTAP_PRINTF("Unknown WTAP IOCTL\n");
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error = EINVAL;
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}
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CURVNET_RESTORE();
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return error;
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}
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