1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 * 31 * $FreeBSD$ 32 */ 33 #include <sys/param.h> 34 #include <sys/module.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/sysctl.h> 38 #include <sys/mbuf.h> 39 #include <sys/malloc.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/proc.h> 43 #include <sys/ucred.h> 44 #include <sys/jail.h> 45 46 #include <sys/sockio.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/errno.h> 50 #include <sys/callout.h> 51 #include <sys/endian.h> 52 #include <sys/kthread.h> 53 #include <sys/taskqueue.h> 54 #include <sys/priv.h> 55 #include <sys/sysctl.h> 56 57 #include <machine/bus.h> 58 59 #include <net/if.h> 60 #include <net/if_dl.h> 61 #include <net/if_media.h> 62 #include <net/if_types.h> 63 #include <net/if_arp.h> 64 #include <net/ethernet.h> 65 #include <net/if_llc.h> 66 #include <net/vnet.h> 67 68 #include <net80211/ieee80211_var.h> 69 #include <net80211/ieee80211_regdomain.h> 70 71 #include <net/bpf.h> 72 73 #include <sys/errno.h> 74 #include <sys/conf.h> /* cdevsw struct */ 75 #include <sys/uio.h> /* uio struct */ 76 77 #include <netinet/in.h> 78 #include <netinet/if_ether.h> 79 80 #include "visibility.h" 81 82 /* Function prototypes */ 83 static d_ioctl_t vis_ioctl; 84 85 static struct cdevsw vis_cdevsw = { 86 .d_version = D_VERSION, 87 .d_flags = 0, 88 .d_ioctl = vis_ioctl, 89 .d_name = "visctl", 90 }; 91 92 void 93 visibility_init(struct wtap_plugin *plugin) 94 { 95 struct visibility_plugin *vis_plugin; 96 97 vis_plugin = (struct visibility_plugin *) plugin; 98 plugin->wp_sdev = make_dev(&vis_cdevsw,0,UID_ROOT,GID_WHEEL,0600, 99 (const char *)"visctl"); 100 plugin->wp_sdev->si_drv1 = vis_plugin; 101 mtx_init(&vis_plugin->pl_mtx, "visibility_plugin mtx", 102 NULL, MTX_DEF | MTX_RECURSE); 103 printf("Using visibility wtap plugin...\n"); 104 } 105 106 void 107 visibility_deinit(struct wtap_plugin *plugin) 108 { 109 struct visibility_plugin *vis_plugin; 110 111 vis_plugin = (struct visibility_plugin *) plugin; 112 destroy_dev(plugin->wp_sdev); 113 mtx_destroy(&vis_plugin->pl_mtx); 114 free(vis_plugin, M_WTAP_PLUGIN); 115 printf("Removing visibility wtap plugin...\n"); 116 } 117 118 /* We need to use a mutex lock when we read out a visibility map 119 * and when we change visibility map from user space through IOCTL 120 */ 121 void 122 visibility_work(struct wtap_plugin *plugin, struct packet *p) 123 { 124 struct visibility_plugin *vis_plugin = 125 (struct visibility_plugin *) plugin; 126 struct wtap_hal *hal = (struct wtap_hal *)vis_plugin->base.wp_hal; 127 struct vis_map *map; 128 129 KASSERT(mtod(p->m, const char *) != (const char *) 0xdeadc0de || 130 mtod(p->m, const char *) != NULL, 131 ("[%s] got a corrupt packet from master queue, p->m=%p, p->id=%d\n", 132 __func__, p->m, p->id)); 133 DWTAP_PRINTF("[%d] BROADCASTING m=%p\n", p->id, p->m); 134 mtx_lock(&vis_plugin->pl_mtx); 135 map = &vis_plugin->pl_node[p->id]; 136 mtx_unlock(&vis_plugin->pl_mtx); 137 138 /* This is O(n*n) which is not optimal for large 139 * number of nodes. Another way of doing it is 140 * creating groups of nodes that hear each other. 141 * Atleast for this simple static node plugin. 142 */ 143 for(int i=0; i<ARRAY_SIZE; ++i){ 144 uint32_t index = map->map[i]; 145 for(int j=0; j<32; ++j){ 146 int vis = index & 0x01; 147 if(vis){ 148 int k = i*ARRAY_SIZE + j; 149 if(hal->hal_devs[k] != NULL 150 && hal->hal_devs[k]->up == 1){ 151 struct wtap_softc *sc = 152 hal->hal_devs[k]; 153 struct mbuf *m = 154 m_dup(p->m, M_NOWAIT); 155 DWTAP_PRINTF("[%d] duplicated old_m=%p" 156 "to new_m=%p\n", p->id, p->m, m); 157 #if 0 158 printf("[%d] sending to %d\n", 159 p->id, k); 160 #endif 161 wtap_inject(sc, m); 162 } 163 } 164 index = index >> 1; 165 } 166 } 167 } 168 169 static void 170 add_link(struct visibility_plugin *vis_plugin, struct link *l) 171 { 172 173 mtx_lock(&vis_plugin->pl_mtx); 174 struct vis_map *map = &vis_plugin->pl_node[l->id1]; 175 int index = l->id2/ARRAY_SIZE; 176 int bit = l->id2 % ARRAY_SIZE; 177 uint32_t value = 1 << bit; 178 map->map[index] = map->map[index] | value; 179 mtx_unlock(&vis_plugin->pl_mtx); 180 #if 0 181 printf("l->id1=%d, l->id2=%d, map->map[%d] = %u, bit=%d\n", 182 l->id1, l->id2, index, map->map[index], bit); 183 #endif 184 } 185 186 static void 187 del_link(struct visibility_plugin *vis_plugin, struct link *l) 188 { 189 190 mtx_lock(&vis_plugin->pl_mtx); 191 struct vis_map *map = &vis_plugin->pl_node[l->id1]; 192 int index = l->id2/ARRAY_SIZE; 193 int bit = l->id2 % ARRAY_SIZE; 194 uint32_t value = 1 << bit; 195 map->map[index] = map->map[index] & ~value; 196 mtx_unlock(&vis_plugin->pl_mtx); 197 #if 0 198 printf("map->map[index] = %u\n", map->map[index]); 199 #endif 200 } 201 202 int 203 vis_ioctl(struct cdev *sdev, u_long cmd, caddr_t data, 204 int fflag, struct thread *td) 205 { 206 struct visibility_plugin *vis_plugin = 207 (struct visibility_plugin *) sdev->si_drv1; 208 struct wtap_hal *hal = vis_plugin->base.wp_hal; 209 struct link l; 210 int op; 211 int error = 0; 212 213 CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); 214 switch(cmd) { 215 case VISIOCTLOPEN: 216 op = *(int *)data; 217 if(op == 0) 218 medium_close(hal->hal_md); 219 else 220 medium_open(hal->hal_md); 221 break; 222 case VISIOCTLLINK: 223 l = *(struct link *)data; 224 if(l.op == 0) 225 del_link(vis_plugin, &l); 226 else 227 add_link(vis_plugin, &l); 228 #if 0 229 printf("op=%d, id1=%d, id2=%d\n", l.op, l.id1, l.id2); 230 #endif 231 break; 232 default: 233 DWTAP_PRINTF("Unknown WTAP IOCTL\n"); 234 error = EINVAL; 235 } 236 237 CURVNET_RESTORE(); 238 return error; 239 } 240