1 /*- 2 * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 * 29 * $FreeBSD$ 30 */ 31 #include <sys/param.h> 32 #include <sys/module.h> 33 #include <sys/kernel.h> 34 #include <sys/systm.h> 35 #include <sys/sysctl.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/ucred.h> 42 #include <sys/jail.h> 43 44 #include <sys/sockio.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/errno.h> 48 #include <sys/callout.h> 49 #include <sys/endian.h> 50 #include <sys/kthread.h> 51 #include <sys/taskqueue.h> 52 #include <sys/priv.h> 53 #include <sys/sysctl.h> 54 55 #include <machine/bus.h> 56 57 #include <net/if.h> 58 #include <net/if_dl.h> 59 #include <net/if_media.h> 60 #include <net/if_types.h> 61 #include <net/if_arp.h> 62 #include <net/ethernet.h> 63 #include <net/if_llc.h> 64 #include <net/vnet.h> 65 66 #include <net80211/ieee80211_var.h> 67 #include <net80211/ieee80211_regdomain.h> 68 69 #include <net/bpf.h> 70 71 72 #include <sys/errno.h> 73 #include <sys/conf.h> /* cdevsw struct */ 74 #include <sys/uio.h> /* uio struct */ 75 76 #include <netinet/in.h> 77 #include <netinet/if_ether.h> 78 79 #include "visibility.h" 80 81 /* Function prototypes */ 82 static d_ioctl_t vis_ioctl; 83 84 static struct cdevsw vis_cdevsw = { 85 .d_version = D_VERSION, 86 .d_flags = 0, 87 .d_ioctl = vis_ioctl, 88 .d_name = "visctl", 89 }; 90 91 void 92 visibility_init(struct wtap_plugin *plugin) 93 { 94 struct visibility_plugin *vis_plugin; 95 96 vis_plugin = (struct visibility_plugin *) plugin; 97 plugin->wp_sdev = make_dev(&vis_cdevsw,0,UID_ROOT,GID_WHEEL,0600, 98 (const char *)"visctl"); 99 plugin->wp_sdev->si_drv1 = vis_plugin; 100 mtx_init(&vis_plugin->pl_mtx, "visibility_plugin mtx", 101 NULL, MTX_DEF | MTX_RECURSE); 102 printf("Using visibility wtap plugin...\n"); 103 } 104 105 void 106 visibility_deinit(struct wtap_plugin *plugin) 107 { 108 struct visibility_plugin *vis_plugin; 109 110 vis_plugin = (struct visibility_plugin *) plugin; 111 destroy_dev(plugin->wp_sdev); 112 mtx_destroy(&vis_plugin->pl_mtx); 113 free(vis_plugin, M_WTAP_PLUGIN); 114 printf("Removing visibility wtap plugin...\n"); 115 } 116 117 /* We need to use a mutex lock when we read out a visibility map 118 * and when we change visibility map from user space through IOCTL 119 */ 120 void 121 visibility_work(struct wtap_plugin *plugin, struct packet *p) 122 { 123 struct visibility_plugin *vis_plugin = 124 (struct visibility_plugin *) plugin; 125 struct wtap_hal *hal = (struct wtap_hal *)vis_plugin->base.wp_hal; 126 struct vis_map *map; 127 128 KASSERT(mtod(p->m, const char *) != (const char *) 0xdeadc0de || 129 mtod(p->m, const char *) != NULL, 130 ("[%s] got a corrupt packet from master queue, p->m=%p, p->id=%d\n", 131 __func__, p->m, p->id)); 132 DWTAP_PRINTF("[%d] BROADCASTING m=%p\n", p->id, p->m); 133 mtx_lock(&vis_plugin->pl_mtx); 134 map = &vis_plugin->pl_node[p->id]; 135 mtx_unlock(&vis_plugin->pl_mtx); 136 137 /* This is O(n*n) which is not optimal for large 138 * number of nodes. Another way of doing it is 139 * creating groups of nodes that hear each other. 140 * Atleast for this simple static node plugin. 141 */ 142 for(int i=0; i<ARRAY_SIZE; ++i){ 143 uint32_t index = map->map[i]; 144 for(int j=0; j<32; ++j){ 145 int vis = index & 0x01; 146 if(vis){ 147 int k = i*ARRAY_SIZE + j; 148 if(hal->hal_devs[k] != NULL 149 && hal->hal_devs[k]->up == 1){ 150 struct wtap_softc *sc = 151 hal->hal_devs[k]; 152 struct mbuf *m = 153 m_dup(p->m, M_NOWAIT); 154 DWTAP_PRINTF("[%d] duplicated old_m=%p" 155 "to new_m=%p\n", p->id, p->m, m); 156 #if 0 157 printf("[%d] sending to %d\n", 158 p->id, k); 159 #endif 160 wtap_inject(sc, m); 161 } 162 } 163 index = index >> 1; 164 } 165 } 166 } 167 168 static void 169 add_link(struct visibility_plugin *vis_plugin, struct link *l) 170 { 171 172 mtx_lock(&vis_plugin->pl_mtx); 173 struct vis_map *map = &vis_plugin->pl_node[l->id1]; 174 int index = l->id2/ARRAY_SIZE; 175 int bit = l->id2 % ARRAY_SIZE; 176 uint32_t value = 1 << bit; 177 map->map[index] = map->map[index] | value; 178 mtx_unlock(&vis_plugin->pl_mtx); 179 #if 0 180 printf("l->id1=%d, l->id2=%d, map->map[%d] = %u, bit=%d\n", 181 l->id1, l->id2, index, map->map[index], bit); 182 #endif 183 } 184 185 static void 186 del_link(struct visibility_plugin *vis_plugin, struct link *l) 187 { 188 189 mtx_lock(&vis_plugin->pl_mtx); 190 struct vis_map *map = &vis_plugin->pl_node[l->id1]; 191 int index = l->id2/ARRAY_SIZE; 192 int bit = l->id2 % ARRAY_SIZE; 193 uint32_t value = 1 << bit; 194 map->map[index] = map->map[index] & ~value; 195 mtx_unlock(&vis_plugin->pl_mtx); 196 #if 0 197 printf("map->map[index] = %u\n", map->map[index]); 198 #endif 199 } 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 } 240 241