npf.c revision 1.21
1 /* $NetBSD: npf.c,v 1.21 2014/07/23 01:25:34 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2009-2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This material is based upon work partially supported by The 8 * NetBSD Foundation under a contract with Mindaugas Rasiukevicius. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * 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 IN 27 * 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 THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * NPF main: dynamic load/initialisation and unload routines. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: npf.c,v 1.21 2014/07/23 01:25:34 rmind Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 42 #include <sys/atomic.h> 43 #include <sys/conf.h> 44 #include <sys/kauth.h> 45 #include <sys/kmem.h> 46 #include <sys/lwp.h> 47 #include <sys/module.h> 48 #include <sys/percpu.h> 49 #include <sys/rwlock.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/uio.h> 53 54 #include "npf_impl.h" 55 #include "npf_conn.h" 56 57 /* 58 * Module and device structures. 59 */ 60 MODULE(MODULE_CLASS_DRIVER, npf, NULL); 61 62 void npfattach(int); 63 64 static int npf_fini(void); 65 static int npf_dev_open(dev_t, int, int, lwp_t *); 66 static int npf_dev_close(dev_t, int, int, lwp_t *); 67 static int npf_dev_ioctl(dev_t, u_long, void *, int, lwp_t *); 68 static int npf_dev_poll(dev_t, int, lwp_t *); 69 static int npf_dev_read(dev_t, struct uio *, int); 70 71 static int npfctl_stats(void *); 72 73 static percpu_t * npf_stats_percpu __read_mostly; 74 static struct sysctllog * npf_sysctl __read_mostly; 75 76 const struct cdevsw npf_cdevsw = { 77 .d_open = npf_dev_open, 78 .d_close = npf_dev_close, 79 .d_read = npf_dev_read, 80 .d_write = nowrite, 81 .d_ioctl = npf_dev_ioctl, 82 .d_stop = nostop, 83 .d_tty = notty, 84 .d_poll = npf_dev_poll, 85 .d_mmap = nommap, 86 .d_kqfilter = nokqfilter, 87 .d_flag = D_OTHER | D_MPSAFE 88 }; 89 90 static int 91 npf_init(void) 92 { 93 #ifdef _MODULE 94 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 95 #endif 96 int error = 0; 97 98 npf_stats_percpu = percpu_alloc(NPF_STATS_SIZE); 99 npf_sysctl = NULL; 100 101 npf_bpf_sysinit(); 102 npf_worker_sysinit(); 103 npf_tableset_sysinit(); 104 npf_conn_sysinit(); 105 npf_nat_sysinit(); 106 npf_alg_sysinit(); 107 npf_ext_sysinit(); 108 109 /* Load empty configuration. */ 110 npf_pfil_register(true); 111 npf_config_init(); 112 113 #ifdef _MODULE 114 /* Attach /dev/npf device. */ 115 error = devsw_attach("npf", NULL, &bmajor, &npf_cdevsw, &cmajor); 116 if (error) { 117 /* It will call devsw_detach(), which is safe. */ 118 (void)npf_fini(); 119 } 120 #endif 121 return error; 122 } 123 124 static int 125 npf_fini(void) 126 { 127 /* At first, detach device and remove pfil hooks. */ 128 #ifdef _MODULE 129 devsw_detach(NULL, &npf_cdevsw); 130 #endif 131 npf_pfil_unregister(true); 132 npf_config_fini(); 133 134 /* Finally, safe to destroy the subsystems. */ 135 npf_ext_sysfini(); 136 npf_alg_sysfini(); 137 npf_nat_sysfini(); 138 npf_conn_sysfini(); 139 npf_tableset_sysfini(); 140 npf_bpf_sysfini(); 141 142 /* Note: worker is the last. */ 143 npf_worker_sysfini(); 144 145 if (npf_sysctl) { 146 sysctl_teardown(&npf_sysctl); 147 } 148 percpu_free(npf_stats_percpu, NPF_STATS_SIZE); 149 150 return 0; 151 } 152 153 /* 154 * Module interface. 155 */ 156 static int 157 npf_modcmd(modcmd_t cmd, void *arg) 158 { 159 160 switch (cmd) { 161 case MODULE_CMD_INIT: 162 return npf_init(); 163 case MODULE_CMD_FINI: 164 return npf_fini(); 165 case MODULE_CMD_AUTOUNLOAD: 166 if (npf_autounload_p()) { 167 return EBUSY; 168 } 169 break; 170 default: 171 return ENOTTY; 172 } 173 return 0; 174 } 175 176 void 177 npfattach(int nunits) 178 { 179 180 /* Void. */ 181 } 182 183 static int 184 npf_dev_open(dev_t dev, int flag, int mode, lwp_t *l) 185 { 186 187 /* Available only for super-user. */ 188 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FIREWALL, 189 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, NULL, NULL)) { 190 return EPERM; 191 } 192 return 0; 193 } 194 195 static int 196 npf_dev_close(dev_t dev, int flag, int mode, lwp_t *l) 197 { 198 199 return 0; 200 } 201 202 static int 203 npf_dev_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 204 { 205 int error; 206 207 /* Available only for super-user. */ 208 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FIREWALL, 209 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, NULL, NULL)) { 210 return EPERM; 211 } 212 213 switch (cmd) { 214 case IOC_NPF_TABLE: 215 error = npfctl_table(data); 216 break; 217 case IOC_NPF_RULE: 218 error = npfctl_rule(cmd, data); 219 break; 220 case IOC_NPF_STATS: 221 error = npfctl_stats(data); 222 break; 223 case IOC_NPF_SAVE: 224 error = npfctl_save(cmd, data); 225 break; 226 case IOC_NPF_SWITCH: 227 error = npfctl_switch(data); 228 break; 229 case IOC_NPF_LOAD: 230 error = npfctl_load(cmd, data); 231 break; 232 case IOC_NPF_VERSION: 233 *(int *)data = NPF_VERSION; 234 error = 0; 235 break; 236 default: 237 error = ENOTTY; 238 break; 239 } 240 return error; 241 } 242 243 static int 244 npf_dev_poll(dev_t dev, int events, lwp_t *l) 245 { 246 247 return ENOTSUP; 248 } 249 250 static int 251 npf_dev_read(dev_t dev, struct uio *uio, int flag) 252 { 253 254 return ENOTSUP; 255 } 256 257 bool 258 npf_autounload_p(void) 259 { 260 return !npf_pfil_registered_p() && npf_default_pass(); 261 } 262 263 /* 264 * NPF statistics interface. 265 */ 266 267 void 268 npf_stats_inc(npf_stats_t st) 269 { 270 uint64_t *stats = percpu_getref(npf_stats_percpu); 271 stats[st]++; 272 percpu_putref(npf_stats_percpu); 273 } 274 275 void 276 npf_stats_dec(npf_stats_t st) 277 { 278 uint64_t *stats = percpu_getref(npf_stats_percpu); 279 stats[st]--; 280 percpu_putref(npf_stats_percpu); 281 } 282 283 static void 284 npf_stats_collect(void *mem, void *arg, struct cpu_info *ci) 285 { 286 uint64_t *percpu_stats = mem, *full_stats = arg; 287 int i; 288 289 for (i = 0; i < NPF_STATS_COUNT; i++) { 290 full_stats[i] += percpu_stats[i]; 291 } 292 } 293 294 /* 295 * npfctl_stats: export collected statistics. 296 */ 297 static int 298 npfctl_stats(void *data) 299 { 300 uint64_t *fullst, *uptr = *(uint64_t **)data; 301 int error; 302 303 fullst = kmem_zalloc(NPF_STATS_SIZE, KM_SLEEP); 304 percpu_foreach(npf_stats_percpu, npf_stats_collect, fullst); 305 error = copyout(fullst, uptr, NPF_STATS_SIZE); 306 kmem_free(fullst, NPF_STATS_SIZE); 307 return error; 308 } 309
Indexes created Fri Sep 26 08:10:20 GMT 2025